Practice Problems
Net F = ma
Directions:
On this worksheet, positive horizontal directions are towards the right and positive vertical directions are upwards.
omit
Question 1
What is the net force acting on a 8-kg mass if it is accelerating at a rate of 4 m/sec
^{2}
?
3.2 x 10
^{1}
nts
0 nts
1.2 x 10
^{1}
nts
5 x 10
^{-1}
nts
omit
Question 2
What is the magnitude of the frictional force present if a 8-kg mass being pulled by a horizontal force of 10 newtons towards the right experiences an acceleration of -0.75 m/sec
^{2}
?
6 x 10
^{0}
nts
1.67 x 10
^{0}
nts
1.07 x 10
^{1}
nts
1.6 x 10
^{1}
nts
omit
Question 3
A 8-kg mass experiences two vertical forces: 39.8 newtons pulling upward and 78.4 newtons pulling downward. What acceleration does the 8-kg mass undergo?
-4.8 m/sec
^{2}
14.8 m/sec
^{2}
-30.6 m/sec
^{2}
38.6 m/sec
^{2}
omit
Question 4
A 8-kg mass is being pulled towards the right with a rope that has a tension of 70 newtons at an angle of 27 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
8.8 m/sec
^{2}
3.8 m/sec
^{2}
4.0 m/sec
^{2}
7.8 m/sec
^{2}
omit
Question 5
A 20-gram bullet travelling at 70 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 27 centimeters, what average resistive force did the tree exert upon it?
-1.81 x 10
^{3}
nts
-5.19 x 10
^{0}
nts
-1.4 x 10
^{0}
nts
-1.81 x 10
^{2}
nts
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